Vehicle bolster-spring



(No Model.)

J. W. WETMORE.

VEHICLE BOLSTER SPRING.

No. 389,034. Patented Sept. 4, 1888.

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JEROME XV. \VETMORE, OF ERIE, PENNSYLVANIA.

VEHICLE BOLSTER=SPRENG.

EQPECIFICATION forming part of Letters Patent No. 389,03 dated September 4, 1888.

(No model.)

To all whom it may concern.-

Be it known that I, JEROME W. W'ETMQRE, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invent-ed certain new and useful Improvements in Vehicle Springs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

My invention relates to movable spiral torsion bolstersprings for wagons.

The torsion bolster-springs now in usehave lever-arms which slip on friction bolstenplates or are hungin links. The cylindrical spiral spring has room for motion only between its successive rings, and is rigid, and the conical spiral spring loses its comparatively slow and easy motion by its larger rings resting, under pressure, on its base of support.

The objects of my improvement are to obviate the slipping and thelink connections of the torsion-springs, the limited and rigid motion of the cylindrical spiral springs, and the quicker and sharper motion of the conical coil'springs under pressure. I attain these objects by the construction illustrated in the accompanying drawings, in which- Figure 1. is an end view of the spring on a lumber-wagon; Fig. 2, a side View showing the spring and cross-sections of the axle and bolster-board; Fi g. 3, a plan view of the spring on the axle; Fig. 4., a plan View of the spring under the bolster-board; Fig. 5, a perspective view of the bolster-plate; Fig. 6, the end of the spring resting on the bolster without the bolster-plate, as it may be used.

A B are the body and axle of the wagon; O, the spring; (I, the bolster-plate; e f, the bolsterplate of malleable iron. One flange, a, is cast at right angles to the plane of the plate. The other edge, e, is cast in the same plane, and serrated,so that it can be readily bent down to fit the bolster,as shown by f and j, Figs. 5 and 2.

The end of the spring is in a clip, it. The spring-bar passes from the plate through the clip 9, and thejaws ofg h are bent down into it. i is the bolster-board,of the usual form, the notch for the stake being shown at m. A clip will hold the end of the spring Z to the bolsterboard, and another, at right angles to the clip at twill hold the spring at k, as seen in Fig. 4.

The spring is placed longitudinally across the axle, so as better to withstand theforward and backward thrusts of the load and lessen the strain on the stakes.

Preferably the radius of the large curve about double that of the smaller, and the pressure of the load is quite directly over the bolster and the bolster-plate. hen the ends of the spring are firmly held, the radii of the curves are levers for torsional action in the spring and the torsional motions meet along the large curve when the vehicle is at rest.

The spring may be made of fiat bar-steel, and the upper arm perforated and bolted to the bolster-board.

\Vhat I claim is- 1. The oblong spiral torsion-spring, in 00111- bination with the bolster and bolster-board of the vehicle, substantially as described.

2. The vehicle bolster-spring composed of the oblong loops and horizontal upper and lower arms, the end of the upper arm being bent in its horizontal plane to adapt it to be firmly held under the body of the vehicle, and the end of the lower arm adapted to be so held on the bolster, substantially as described.

3. The oblong vehicle bolster-spring con structed to be firmly held on the bolster-board and bolster-plate, and adapted to the vehicle, substantially as described.

4. The bolster-plate, in combination with the vehicle spring, substantially as described.

JEROME W. WETMORE.

Witnesses:

WALTER Soor'r, Wit. 1?. Harps. 

